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弧長計算
Author:
鍾文欽
GeoGebra
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四邊形的特性
三位數除以一位數（二）
兩組對邊相等的四邊形
拼砌四邊形
GeoGebra笔记功能体验课件
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Mobius 變換
特別角的三角函數值(1)
圓錐
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Geometry: Types of Angles 2 (幾何：角的種類 2)
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Area
Logic
Inequalities
Ellipse
Combinatorics